If I was to game plan against Duke I'd definitely pay attention to the 3 pt shooters in general. I then would have made it a priority to shutdown Mr. Rivers. As for having Dre stand in the corner, well if he chose to do that so be it. I wouldn't be to concerned about him until he showed me he was on.
You do realize that Dre had six games this past season where he scored ZERO points. His last six games were 0, 3, 0, 0, 0, and 5.
His scoring numbers for this season is nearly identical to his numbers from last season. Where was the improvement?
I hope that's serious enough for you.